package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    @Override
    public void remove(Long id) {
        //添加查询条件，根据分类id进行查询菜品数据
        LambdaQueryWrapper<Dish> dishLQW = new LambdaQueryWrapper<>();
        dishLQW.eq(Dish::getCategoryId, id);
        int countDish = dishService.count(dishLQW);
        //依据数量判断，大于0则有关联菜品，如果已经关联，抛出一个业务异常
        if (countDish > 0) {
            throw new CustomException("当前分类下关联了菜品，不能删除");//已经关联菜品，抛出一个业务异常
            //注意：这里由于没有返回值，所以使用异常抛出异常消息
            //return R.error("xxxx"); 不可以使用这个，因为这个方法没有返回值，有返回值才可以使用
        }

        //查询当前分类是否关联了套餐
        LambdaQueryWrapper<Setmeal> setmealLQW = new LambdaQueryWrapper<>();
        setmealLQW.eq(Setmeal::getCategoryId, id);
        int countSetmeal = setmealService.count(setmealLQW);
        //依据数量判断，大于0则有关联套餐，如果已经关联，抛出一个业务异常
        if (countSetmeal > 0) {
            throw new CustomException("当前分类下关联了套餐，不能删除");//已经关联套餐，抛出一个业务异常
        }

        //若没有关联，执行正常分类删除
        super.removeById(id);

    }
}
